Indication to end expectant management of placenta previa. (LQ)
|D||Haemodynamically stable with no blood loss|
a. Vasa previa is an aberration that is seen with velamentous insertion of cord.
b. If the cord implants in the membrane and vessels start dividing before entering the placenta they are unsupported by any tissue.
c. If the vessels lie ahead of the presenting part over internal os (vasa previa), during labour when cervix dilates ,due to shear stress membrane with vessels rupture which results in quick fetal exsanguination as fetal vessels have no valves. The fetal mortality is 75-100%